I'll start with the negatives: the reverbs do not react with the voice well at all and come out muddy on myself and most voices I have used this with. The only remotely useful reverb on here is the Hall verb, but like I said - MUD. The next feature that is practically useless is the "correction". Seriously, I am not looking for a miracle worker here, and I absolutely sing very well, on pitch. I wanted something to smooth out transitions and gently control vibrato, which is what you would expect from something like this. Instead, it sounds like this thing is processing too slowly and actually layers your real time vocals on top of the processed vocal, so you what you get is his awful phase effect.
Now that that is over, here's what I like: The slap and echo settings are useful, especially on the dry side, just to add a little body and sustain to your vocals. I also like the crompression that comes along with the tone/mic control. However, I wish it was adjustable because I like extra compression on my voice.
Overall 3/5 because there are some useful features, but some of the key features are useless. Why put it on there if you can't do it right, TC-Helicon?